It looks like they have dramatically reduced the number of stars you get for filling in each tile (previously it was 20 stars) and each row (previously 10 stars) but you get a lot more for completing the board (240 instead of 40).
Seems to be targeted as not all Starbucks users will be eligible.Taxes, tips, donations, and fees (such as delivery fees, shipping and handling fees, gift wrapping fees and bag fees) may also be excluded. Stars may not be earned on purchases of alcohol or Starbucks Cards.Must pay with your registered Starbucks Card or your registered Starbucks Card through the App.
Basically everybody receives a board (everybody’s is different) and you get bonus stars as follows: If the link doesn’t work, try again later today or tomorrow as it looks like it’s still being rolled out Direct link to offer (or try this link if that one doesn’t work).